Pd/Ce-containing hexagonal mesoporous silicas(HMS) materials were synthesized by the post-assembly and impregnation methods in order to prepare new type Pd supported catalysts.Structure and surface chemical state of the products were characterized with powder X-ray diffraction patterns(XRD)

N2 adsorption

Fourier-transform infrared spectra(FT-IR) and X-ray photoelectron spectroscopy(XPS)

etc.The results showed that ordered hexagonal mesostructure were kept well after Ce and Pd species were assembled with Brunauer-Emmett-Teller(BET) surface areas 933.4 m2·g-1 and pore volume 0.803 cm3·g-1.Ce and Pd surface species were mainly PdO2 and CeO2.Cerium was incorporated presumably into the framework and/or into the walls of silica matrix of HMS structure by the reaction with the pore surface Si—OH groups

and clogging of channels with Pd clusters was avoided by introducing the reagent when the surfactant template was still present in the mesoporous channels.